Figure 1.

Pulmonary histopathology in fatal coronavirus disease cases caused by severe acute respiratory syndrome coronavirus 2 infection. A) Patient no. 5: tracheitis characterized by moderate mononuclear inflammation within the submucosa (original magnification ×10). B) Patient no. 3: extensive denudation of tracheal epithelium; submucosal congestion, mild edema, and mononuclear inflammation (original magnification ×10). C) Patient no. 4: exudative phase of diffuse alveolar damage characterized by abundant hyaline membranes lining alveolar spaces (arrow) (original magnification ×20). D) Patient no. 8: proliferative phase of diffuse alveolar damage characterized by proliferation of type II pneumocytes (arrow) (original magnification ×20). E) Patient no. 1: atypical pneumocytes with enlarged and multiple nuclei, and expanded cytoplasm in a case with proliferative DAD (original magnification ×40). F) Patient no. 7: bronchopneumonia with filling of alveolar spaces by neutrophils and patchy hemorrhage (arrow) (original magnification ×10).